Coated articles with optical coatings having residual compressive stress

Abstract

Disclosed herein are coated articles which may include a substrate and an optical coating that includes one or more layers of deposited material. At least a portion of the optical coating may include a residual compressive stress of more than 100 MPa. The coated article may include a strain-to-failure of 0.4% or more as measured by a Ring-on-Ring Tensile Testing Procedure. The optical coating may include a maximum hardness of 8 GPa or more and an average photopic transmission of 50% or greater.

What is claimed is: 
     
       1. A coated article comprising:
 a substrate comprising a major surface; 
 an optical coating disposed on the major surface of the substrate and forming an air-side surface, the optical coating comprising one or more layers of deposited material; 
 wherein: 
 at least a portion of the optical coating comprises a residual compressive stress of more than 100 MPa; 
 the coated article comprises a strain-to-failure of 0.4% or more as measured by a Ring-on-Ring Tensile Testing Procedure; 
 the optical coating comprises a maximum hardness of 8 GPa or more as measured on the air-side surface by a Berkovich Indenter Hardness Test along an indentation depth of 50 nm and greater; and 
 the coated article comprises an average photopic transmission of 50% or greater. 
 
     
     
       2. The coated article of  claim 1 , wherein at least a portion of the optical coating comprises a residual compressive stress of more than 500 MPa. 
     
     
       3. The coated article of  claim 1 , wherein:
 the optical coating comprises a maximum hardness of 12 GPa or more as measured on the air-side surface by a Berkovich Indenter Hardness Test along an indentation depth of 50 nm and greater; and 
 the optical coating comprises a physical thickness of 1 micron or greater. 
 
     
     
       4. The coated article of  claim 1 , wherein the coated article comprises an average photopic transmission of 80% or greater. 
     
     
       5. The coated article of  claim 1 , wherein the substrate comprises glass or glass-ceramic. 
     
     
       6. The coated article of  claim 1 , wherein the substrate is chemically strengthened. 
     
     
       7. The coated article of  claim 1 , wherein the optical coating is a single layer. 
     
     
       8. The coated article of  claim 1 , wherein the optical coating comprise two or more layers. 
     
     
       9. The coated article of  claim 1 , wherein the optical coating comprises a gradient layer, wherein the gradient layer changes in composition, refractive index, or both. 
     
     
       10. The coated article of  claim 1 , wherein:
 the optical coating further comprises a scratch-resistant layer; and 
 the gradient layer is positioned between the substrate and the scratch-resistant layer. 
 
     
     
       11. The coated article of  claim 1 , wherein the optical coating comprises SiO x N y . 
     
     
       12. A consumer electronic product, comprising:
 a housing having a front surface, a back surface and side surfaces; 
 electrical components provided at least partially within the housing, the electrical components including at least a controller, a memory, and a display, the display being provided at or adjacent the front surface of the housing; and 
 a cover glass disposed over the display, wherein at least one of a portion of the housing or the cover glass comprises the coated article of  claim 1 . 
 
     
     
       13. A method for making a coated article, the method comprising:
 depositing an optical coating onto a major surface of a substrate, the optical coating forming an air-side surface and comprising one or more layers of deposited material; 
 wherein: 
 at least a portion of the optical coating comprises a residual compressive stress of more than 100 MPa; 
 the coated article comprises a strain-to-failure of 0.4% or more as measured by a Ring-on-Ring Tensile Testing Procedure; 
 the optical coating comprises a maximum hardness of 8 GPa or more as measured on the air-side surface by a Berkovich Indenter Hardness Test along an indentation depth of 50 nm and greater; and 
 the coated article comprises an average photopic transmission of 50% or greater. 
 
     
     
       14. The method of  claim 13 , wherein at least a portion of the optical coating comprises a residual compressive stress of more than 500 MPa. 
     
     
       15. The method of  claim 13 , wherein:
 the optical coating comprises a maximum hardness of 12 GPa or more as measured on the air-side surface by a Berkovich Indenter Hardness Test along an indentation depth of 50 nm and greater; and 
 the optical coating comprises a physical thickness of 1 micron or greater. 
 
     
     
       16. The method of  claim 13 , wherein the coated article comprises an average photopic transmission of 80% or greater. 
     
     
       17. The method of  claim 13 , wherein the substrate comprises glass or glass-ceramic. 
     
     
       18. The method of  claim 13 , wherein the substrate is chemically strengthened. 
     
     
       19. The method of  claim 13 , wherein the optical coating is a single layer. 
     
     
       20. The method of  claim 13 , wherein the optical coating comprise two or more layers.